The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 17, 2002
Filed:
Jun. 07, 2000
Applicant:
Inventors:
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 7/00 ;
U.S. Cl.
CPC ...
G02B 7/00 ;
Abstract
An ultraviolet optical device includes optical parts on which an ultraviolet ray is irradiated. Some or all of the optical parts are arranged in an envelope having a gas inlet port and a gas output port. In the envelope ( ), a dry gas having an amount of moisture (as volume fraction) of 5,000 [ppm] or less and led from the gas inlet port ( ) is sprayed on an optical part in which at least a deterioration in optical characteristics is especially a problem, so that an improvement in the secular change of the optical part can be achieved.